breastmilk spit up

Elizabeth • Momma of 2 beautiful angel boys and a 3 year old girl 💙
My little rarely ever spits up but today she spit up about 15'minutes after nursing and it's had a red tint to it, kind of like blood. My nipples aren't cracked/bleeding so my question is, has anyone else had this happen? What can cause it? And should I be freaking out?